O-(2-amino-4-methyl-pyrimidyl-6)-thiophosphoroamidate

ABSTRACT

THE PRESENT INVENTION CONCERNS NEW PHOSPHORIC ACID AMIDE ESTERS OF THE FORMULA   2-(R3-N(-R4)-),4-(R2-NH-P(=S)(-O-R1)-O-),6-CH3-PYRIMIDINE   WHERE R1 IS ALKYL OF 1 TO 4 CARBON ATOMS, R2 IS ALKYL OF 1 TO 4 CARBON ATOMS, R3 IS HYDROGEN OR ALKYL OF 1 TO 4 CARBON ATOMS, AND R4 IS HYDROGEN OR ALKYL OF 1 TO 4 CARBON ATOMS, AND AGRICULTURALLY OR VETERINARY ACCEPTABLE ACID ADDITION SALTS THEREOF, WHICH POSSES INSECTICIDAL PROPERTIES.

O-(Z-AMINO-A-ME'IHYL-P THIOPHOSPHOROAMIDATE Q Karlheinz Milzner, Base], and Fritz Reisser, TherwiLSwitzerland, assignors to Sandoz Ltd. (also known as Sandoz I US. on. 2titl256.5 R 8 Claims ABSTRACT OF THE DISCLOSURE The present invention concerns new phosphoric acid amide esters of the formula,

s CR1 NHR:

iIFl l wherein R is alkyl of 1 to 4 carbon atoms,"

R is alkyl of 1 to 4 carbon atoms,

R is hydrogen or alkyl of;1 to 4 canbon at oms, and

R is hydrogen oralkyl of Ito carbon atoms,

and agriculturally or veterinary acceptable acid addition salts thereof, which possess insecticidal properties.

The present invention' relates'to new phosphoric acid amide esters. v w v The .present invention provides: compounds of For- R is alkyl of l to 4 carbon atoms, R is alkyl of l to 4 carbonatoms, R is hydrogen or alkyl of 1 to 4 car-hon atoms, and R is hydrogen or alkyl of 1 to ,4 carbon atoms, and acid addition salts thereof.

The present invention'also*provides;a process. for the production of a compound of Formula 'I'or an 'acid'a'ddi- Patented Apr. 30, 1974 with a compound of Formula HI,

wherein R and R have the above significances, and Z is hydrogen or a cation.

Preferred cations are alkali metal cations, particularly sodium, and quaternary amino cations.

,The production may be eiiected as follows:

A compound of Formula II is added to a compound of Formula III each in a solvent inert under the reaction conditions, eg an aromatic hydrocarbon, such as toluene or xylene, a halogenated hydrocarbon such as chlorobenzene or chloroform, a ketone such as acetone or methyl isobutyl ketone, an ether such as dioxane or tetrahydrofuran or an amide such as dimethylformamide. The temperature of the reactants may be between 0' and 100 C., preferably room temperature. If Z in Formula III is hydrogen, it is preferable to employ an acid acceptor such as triethylamine or potassium carbonate. The

, culturally or veterinary acceptable acid addition salts are reaction mixture is conveniently stirred at a temperature between room temperature and the boiling temperature of the solvent for a period of between a few minutes and about 5 hours. The reaction product is worked up in conventional manner. The pure compounds of Formula I are obtained as colorless oils or crystalline products which may be characterized, for example, by their R) value or the melting point. They are soluble in organic solvents and can be readily emulsified with water.

The compounds of general Formulas II and III, required as starting materials, have been described in the literature. H

The compounds of general Formula I and their agrius'ejful .as insecticides as indicated by their insecticidal properties. The compounds are eifective against chewing and'sucking insects and also against spider mites.

The term .insects as used herein includes not only themembers of the class Insecta, but also related or similarnonvertebrate animal organisms belonging to allied classes and including acarids and mites.

The. compounds also possess low toxicity in warmblooded animals and low phytotoxicity. The compounds are therefore indicated for use as insecticides in inhabited rooms, cellars and attics, in stables and the like and in combatting insects in plants and animals, e.g., against mites in veterinarymedicine.

The alkylating ability of the compounds is lower than that of chemically similar compounds specifically disclosed in British Pat. 1,129,563.

tion salt thereof comprising reacting a compound of Forthe form of dusting or spraylng agents, e.g., as solut1ons mula II, y

- z .X 3 e 11 wherein R and R have the above significan6es,iand I 7 X is chlorine or bromine, 1

The compounds may be used in admixture with carriers usually employed for insecticides.

The combatting of insects may be carried out by conventional procedures, e.g. by treating a plant locus, object or animal to be protected, with an insecticidal composition including a compound of the invention. For use in plant protection or in combatting insects in objects or animals, insecticidal compositions may be employed in or dispersions, worked up with water or suitable organic solvents, e.g., alcohol, petroleum or tar distillates, as well as emulsifiers, e.g., liquid polyglycol ethers derived from high molecular weight alcohols, mercaptans or alkyl phenols, and an alkylene oxide. Suitable organic solvents such as ketones, aromatic, optionally halogenated hydrocarbons, or mineral oils,

may also be added to the 7 mixture as solution aids.

The spraying and dusting agents may contain conventional inert carrier materials, e.g., talc, diatomaceous earth, bentonite, pumiceor other'additives such as'tcellulose derivatives as well as the usual wetting agents and adhesives to improve wettability and adhesiveness.

The compounds of the invention may be present in the insecticidal compositions in admixture with other known active agents either in the concentrate forms or in the application forms of the compositions. Concentrate forms may generally contain between 2 and 90%, preferably between 5 and 50% by weight of active agent. The application forms may generally contain between 0.02 and 90% preferably between 0.1 and by weight of activeagent. The active agent concentrates =may be produced. in known manner, e.g.:

(a) parts by weight of a compound of general For.-

mula I are mixed with 25 parts by weight of isooctylphenyldecalglycol ether and 50 parts by weight ofxylene, whereby a clear concentrate solution is obtained which may be readily emulsified and diluted in water to the desired concentration.

(b) .25 parts by ht of a compound ofge neral For- -mula I are mixed with parts by weight'of isooctylphenyloctaglycol ether and 45 parts by weight of 'a petroleum fraction having a boiling point of 210280 (D =0.92) The concentrate may be diluted-with water to the desired concentration. .1-

(c) 50 parts by weight of a compound of generalcFormula I are mixed with 50 parts by weight of isooctylphenyloctaglycol ether. A clear concentrate is'obtained which may be readily emulsified and diluted the desired concentration.

The following application examples illustrate the insecti cidal effectiveness of the compounds of the inventionjbut in no way limit the scope of the invention.

Insecticidal efi'ect against Carausius morosus (Indian;

rod locust)stomach poison efiect Tradescantia branches are immersed for 3 seconds in an emulsion containing 0.0125 of a compound of Formula I to form a coating on each branch. After drying the coating each of the Tradescantia branches is inserted into a small glass tube' filled with water which is placed in a glass dish. 10 Carausius larvae in the second stage ofde velopment are counted into each dish which is then closed in water to with a wire mesh lid. After 5 days the rate of mortality is determined by counting out the live and dea d' animals. The rate of mortality is indicated as a percentage."100% means that all rod locusts were killed, 0% means that no rod locust was killed. The results are set out in. the folv lowing table.

Rate of Compound of Formula I mortality 1 sChN 1 In percent after 5 days.

Insecticidal effect against A fali ae (black bean i Broad bean plants (Viciaifaba) are sprayed to run off with a spraying liquor containing 0.0125 of a compound of Formula I. The broad bean plants are strongly infected with allthe formsof developmentof theblack bean aphid (Aphis f2ibae.). 'Atter 2 days the rateofcmortality is determined-The I mortality rate isindicated .asla percentage. means that allbean aphidstwere-killed, 0% means that no bean aphid was killed. The resultsare set out in Insecticidal effect against l rodeni-a caterpillars (Egyptian leaf worm) ,stomach poisonefieet I. O Prodenia larvae each having a length otabout 7 mm wounteddnto plastic dishes. 'Bush. bean leaves (Phaseolus vulgaris), prepared by spraying bush bean plants to run otf with a spraying liquor containing 100 p.p.m. of a compound of;.Formula I are fed to the larvae. After 6 days the rate of' mortality is determined. 100% means that all Prodenia larvae were killed, 0% means that no Prodenia larvae were killed. The evaluation is indicated in the following table: a

H Rate of Compound of Formula I mortality 1 fi/OCH. 100

ease-k;

t r-anal Instance-sierra; again Bruchidius obte ct us (bean weevil)-contact effect Petri dishes havinga diameter of 7 cm. are sprayed with 0.1-0.2 cc. of an emulsion containing 0.0l25% of 70 a compound of Formula/I. After drying the emulsion for 4 hours 10 Bruchidiu's-lmagine's' are put into each dish, which are covered with a lid of fine mesh brass gauze.

The bean weevils are kept at room temperature and are given no food. After v 48 .h0urs therateof mortality is determined as a percentage 100% slneans that all bean 6. --*EXAMPIEE*2. 'O metliyl-N;n-propyl-of-(idiethyl amino-4-metliyl pyrimidyl 6)-tliiophosphoroalmidate S OCH:

,Rateof-- z;,---; -'ll/ Compound 01 Eormulamortality P\. s .0011, 100 I I nil-110.111

o-r cm.

NHCzH N CH; N N 7 (H;C) N (37.6 g. (0.2 mole) of O-methyl-N-n-propyl-thiophos- N S OCH m0 phoroamidochloridate are added within minutes to a solution of 40.6 g. (0.2 mole) of the sodium salt of 2- diethylamino-4-methyl-6-hydroxy pyrimidine in 200 cc. A NHCH; 15 of toluene at room temperature. The reaction mixture is N subsequently stirred for a further 2 hours at room teml perature and worked up in usual manner after control (CzHs)2N N -CHz of the reaction course by thin layer chromatography.

Analysis.-C H N O S (molecular weight: 332.4). Percent after 481mm 20 Calculated (percent)f c, 47.0; H, 7.6; N, 16.9; 13, 9.3; The following examples illustrate the production of S, 9.6. Found (percent): C, 46,7; .H, 7,4; N, 167; p, 95; the compounds without in any way limiting the scope of S, 9.7. Rf value: 0.55 (ether:hexane=1:2 on silica gel). the invention. The temperatures are indicated in degrees In manner analogous to Examples 1 and 2, the followcentigrade. ing compounds of Formula I are obtained:

Analysis, percent Molec- Calculated Found Molecular ular Rf- .1. Example R1 R1 R3 R4 formula weight value C.) C H N P S C H N P S CH3 CzHs CzHs CHHZINAOZPS 304.4 .4 7.0 18.4 10.2 10.5 43.7 7.2 18.1 9.9 10.3 0211. 02H. 02H. C12H23N402Ps 318.4 11 .3 7.3 17.6 9.7 10.1 44.9 7.3 17.4 9.9 10.3 i-C3H1 02H. C2115 C13H25N402PS 332.4 .0 7.0 16.9 9.3 9.6 46.8 7.7 16.8 9.4 9.7 i-03H CHa CH: C11H21N4O2PS 304.4 4 7.0 19.4 10.2 10.5 43.7 7.1 18.2 10.0 10.8 C2115 CH; CH1 CIQHUNQOZPS 290.32 .4 6.6 19.3 10.7 11.0 41.1 0.7 19.1 11.0 11.2

1 On silica gel thin layer plate, eluant ether: hexane 1:2.

EXAMPLE 1.O-methyl-N-methyl-O-(Z-dimethylamino-4-methyl-pyrimidyl-6)-thiophosphoroamidate 30.2 g. (0.189 mole) of O-methyl-N-methyl-thiophosphoroamidochloridate are added within half an hour to a solution of 32.0 g. (0.189 mole) of the sodium salt of 2-dimethylamino-4-methyl-6-hydroxy pyrimidine in 200 cc. of toluene at room temperature. The reaction mixture is subsequently stirred for half an hour at room temperature and 3 hours at 5060. After cooling, the reaction mixture is filtered with suction, the filtrate is washed with water until the water reaches the pH value of 7, the toluene solution is dried .with sodium sulphate and concentrated by evaporation in a vacuum. O-methyl-N- methyl-O-(Z dimethylamino-4-methyl-pyrimidyl-6)-thiophosphoroamidate is obtained as white crystals and is recrystallized from ether. White crystals, having a melting point of 79.5-80, are obtained.

Analysis.C H N O PS (molecular weight: 276.3). Calculated (percent): C, 39.1; H, 6.2; N, 20.3; P, 11.2; S, 11.6. *Found (percent): C, 38.8; H, 6.1; N, 20.4; P, 11.4; S, 11.8. Rf value: 0.21 (ether:hexane=l:2 on silica gel).

The substances produced as an oil are purified on a silica gel column. Ether:hexane=l:2 is used as eluant. The degree of purity is checked on a silica gel thin layer plate, prepared with a fluorescence indicator with a wavelength maximum of 254 me, with etherzhexane=1z2 as eluant.

In a manner analogous to that described in Examples 1 and 2, the following compounds are produced, viz.

O-methyl-N-methyl-O-(2-methylamino-4-methylpyrimidyl-6 -thiophosphoroamidate, and

O-methyl-N-methyl-O-(2-amino-4-methyl-pyrimidyl 6)-thiophosphoroamidate.

What is claimed is: 1. A compound of the formula wherein R is alkyl of l to 4 carbon atoms,

R is alkyl of 1 to 4 carbon atoms,

R is hydrogen or alkyl of l to 4 carbon atoms, and R is hydrogen or alkyl of 1 to 4 carbon atoms,

or an agriculturally or veterinary acceptable acid addition salt thereof.

2. A compound of claim 1, wherein each of R R R and R is methyl.

3. A compound of claim 1, wherein R is methyl, R is n-propyl, R is ethyl and R is ethyl.

4. A compound of claim 1, wherein R is methyl, R is methyl, R is ethyl and R is ethyl. v

5. A compound of claim 1, wherein R is methyl, R is ethyl, R is ethyl and R is ethyl.

6. A compound of claim 1, wherein R is methyl, R, is isopropyl, R is ethyl and R is ethyl.

7. The compound of claim 1, wherein R is methyl, R is isopropyl, R is methyl and R is methyl.

References Cited UNITED STATES PATENTS 3,159,630 12/1964 Rigtrin k 260256.4E

3,663,544 5/1972 Milzner e t al. 260256.4E

5 RICHARD J. GALLAGHER, Primary Examiner 

